Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=true, so the safety and external-source profile is covered. The description adds the sort order and the shape of returned records but says nothing about pagination, rate limits, or how 'sources' are obtained. Incremental value over annotations is modest.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two tight sentences with no filler, and the most important content (what the tool returns and its ordering) is front-loaded. Slightly dense but every clause earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

There is no output schema, so the description carries the burden of describing returns, and it does so adequately by naming the record fields and their ordering. Combined with the annotation-covered safety profile, an agent has enough to call it, with only pagination and vendor enum semantics left undocumented.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 67% and the description echoes 'vendor' and the days-ahead concept, mapping loosely onto two of three parameters. It adds no format or syntax detail and entirely omits include_retired, so it neither compensates for the uncovered vendor parameter nor extends what the schema already states.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb+resource ('AI model retirement calendar') and enumerates the returned fields (model IDs, shutdown dates, replacements, sources) with a defined ordering ('soonest first'). It is clear what the tool does, though it never explicitly distinguishes itself from the sibling find_retired_models, so sibling differentiation is left implicit.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is only implied: 'Filter by vendor or by how many days ahead to look' tells the agent the two filtering modes but not when to reach for this tool over list_migration_guides or find_retired_models. No exclusions or alternatives are named, so routing between the six siblings is left to inference.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.